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How much further must a stream already at \( M = 3 \) be turned before its pressure reaches zero?

  • A.About 130.5 degrees
  • B.About 49.8 degrees
  • C.About 23.4 degrees
  • D.About 80.7 degrees

Answer: D

The maximum function value is \( 130.45 \) degrees and the flow has already used \( \nu(3) = 49.76 \) degrees of it, so \( 130.45 - 49.76 = 80.7 \) degrees remain. Note how much turning is still nominally available even at Mach 3, though the pressures involved are by then extremely low.

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